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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bc5898fb91e0e7d7bce06f18f1514569b70f0e53e40b4491924ddc3db437a5' 
  AND token = 'mAyPYFt0Fq1m6urvFaqs34kf6pl7sD78mkqJ78EXGJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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