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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149e12350683311c4f83d56753bc8a6cf6660f2fd8cdde00db8e236e30d5b4ef' 
  AND token = 'S/d7yEH72ZHOp6/tcZOCkCO8h1Lh4kJmxyG+/Hnvb2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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