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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79580fdef077ced1e78a07279813bc8151d9464f949ddcc8e243799f473eb6f0' 
  AND token = 'DaiGvKIRnWVFTW54b1eGggixS6PENGGvIGl3+j7A1eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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