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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558d59a5f0e16f9c47c2c307657ea0da0a01367c6bed8906bd49428f521f92df' 
  AND token = '4tgetiY42A5W6IE7BeoiMpTuB33OKeJf2e5gJuLL9/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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