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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4764754466467aa64752ea41d262d7132abab76735aa01f63f8a39aeec17eb7' 
  AND token = 'pkS4cwNWwISUpzhRYhow+qxG/5jP7pemCB1HlHtryz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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