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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19b3e8039ece939d5d5c9abb43db5abace60827cf70a92f9db7968c7f6f93a2' 
  AND token = 'gRPw82GoWntc2rryLct032OpG5fc21RD6okhAfe1y98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}