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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7fcaf81caba8fea91fbc322ccf2b9610691a9526236ff11e2223f888763c67f' 
  AND token = '7Fcnpugv6Y+xu1N17RybT9pPuqz8khD98qFP3t7F16o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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