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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17bdf4040756776c6499ac8f887d6e6e4414d9789e4891f5aed8c82bdb1b1cb' 
  AND token = 'ug0Rycdz7YcXF53/Kda8vTitNybbY7kT3wQtb98pezo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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