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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324039c84aadac5e34bc6817542dbe40b4be7a0c6fa9dc3af56af1876a3eb69f' 
  AND token = 'LDXVKbFlc/wAWS22HDyJwttv99KN1P6/AyZlktyELC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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