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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fbc251e4b1abd4b758fd9ace477007815a93fd9b3585fa7c5c0baed0c33f78c' 
  AND token = '+BW7EMrntWUibQ87HmbxeShemCwEs0qjlnu4oceQKQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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