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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912344293803e6fd08e9941e3e116d0c6afc9c51b050dd0182ce8c44098a6840' 
  AND token = 'iZzRn/f0NZajPc3aX70TdlQkHKbCKJeycg5ooJdFTO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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