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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a5ac92995fc3689d0f268b84c05fa0c407af33b77ce4f84a2c18d7028fe8dd' 
  AND token = 'S7ecnIrJOwEk7knuVhoSFzP9F+Jba5XBwfJDjt6uepk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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