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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1ad5c556cb6b09eaa53cec2210abd4ec0311c2ad156ca063a523252f5d415f' 
  AND token = '+u/GOo4hcexa5ij4/gek58YNI2BCgnn4MBC8SrejmaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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