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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e04c8358cbf7ead035545720cd7bf13de34f612affddb3bd38da05c4058b74' 
  AND token = '/P24EXNnwXO4xv9Rpye8zbjMUNL16YMumfZyuNn2dSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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