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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ebc3760907df9da43289f822486dff062df3f94b3d9d58c5e69b513b4bf8b6' 
  AND token = 'r/L+kpw5hh6z3w2whcfnh7+AwsPXUAnWc1TI2aqPHqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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