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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3bf2c631a8c6cae64f9e05a1d481b4d5111a41e492ff9f2fee99ec435957ad' 
  AND token = 'hMbpEjUCMBmIlvyp38+XokKhtqBoZbW0tNSqpFar5eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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