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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d108597c39eb9a8b660e649d06e7bc4941dce986f27c383817f2ebe26324ac' 
  AND token = 'wDAjDTUz1kOJVi5W3b2xFH4iX4gTuItXtRc6QYSZX8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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