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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637d84eacdd3c554328b9dd96480039078f8e609d36339f95b49ef0f2fc73a59' 
  AND token = 'fuWumL0BOw5aF1bK2ZDqDeeI0bx3JtJ8ykTXgXMLp6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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