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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37edf6ed7d20ece8fd392b4e79c345eb194d544a5c7924c48426713c0501704' 
  AND token = '5GuJURnPlpslq3gxowQ0kLHK8Gy6KF0LK3oW2tIeNH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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