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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c2b03142e4725c58d6f8b53f2c3cd4706726690c94e1b5d2893127bf503532' 
  AND token = '0fiE2Oy2kCItFzEyNV+bA2VAR9fETenL1mAGD+HzHIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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