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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70811f63003f4a0b542004f2427acefdd5bf224e6ba1276803633aa62d54299' 
  AND token = '990rZD/9FFDQxtrIZ9l1hvenJSkpkqt9AbwQExrm5V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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