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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930383973c81c20f0c26b1c1db1db45973c3a33cc4f2edf0a0fb2b0cb6d91bf6' 
  AND token = 'DN1q4rv6sHx/1TWuz07wQctUHsowG/UfxK7chH99fTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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