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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5baa97c0df3bae3a1b626dcbdeeef4eb6783034c7820668142da94c562a28d6e' 
  AND token = 'Lm3D8FDxXnpAXv3jHxCxJDR2nxmJulYOuTFCze32yl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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