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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c5a017177ced09f4d6b571910c21cc64a209b1c9b1ff11d1d73ba38960bedf' 
  AND token = 'hAP8N76kvFHyj3l65LTQYCpwcNNJXiEBIprfte5jXUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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