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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e5d53d49ea034bf716c3aaee3c5d1ebccc53e3ac19237fb85fb7bf65c77c27' 
  AND token = '9n4gW7j8VSxHhen+woIEZypLHt1W9MIZAJvFAPJTi+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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