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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab061552b3d2506365e892183e0ada11886bef629b59681204955bd6b7d0af3' 
  AND token = 'zRHdBu132vVkkNpuq+fDl8P7PKjqoAS89V++fIo2wPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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