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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '580dd98e19f6f09aefcc1d2df4ab1a3c83742f828fa586bdd10e08e8f0c65d51' 
  AND token = 'iqQoCU4LLVhGLQCy9k/cx9WUkh/To5XTADWw4ojWA4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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