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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdfb68f18bcf8f5f8eeecb17c0cb72599b609a915b1d70899c8d4d15fb780bf' 
  AND token = 'MbNZhZW6m4QAD+ldx6p0LFqmJdCRcqrb+DHai7W8+EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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