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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797ed31eaa8c16d42951c0754f754f7aabad2a051100d62486c4c986a515cd3e' 
  AND token = 'Gj5LTZs225/a1X91tzsd2R0zJ1bkF/RZwOniumirnR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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