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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14a74a0f66e908b26088bcdb870b4a9f027ba6cb5cc55a67bb1f0b1bd5fb7e5' 
  AND token = '3z0ono8KMfBk85D1Xf/tEv74+VNWLWccjfia0EeowoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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