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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27da66686125af64f9f3b1de37862f711bbaae6b6873972864c658bfdd7deabe' 
  AND token = 'w6g1fULWaGkvWC8jNzYuIRyCa9mEtNilPEGkWYLMjlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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