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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caeac0ca98f47cfe51c8f1476c6d8c5539781cd0e691f2270e284617b13bcfda' 
  AND token = '4/hou8VC4ZNMt/Ae3dl1PFqbdWPgxkGQ+6DQ0YE3PHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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