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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c876295caedb74e9a3a5b2c775ac6491b7fe536573717df7ee4a2a45cf447403' 
  AND token = 'H3SwGG9vBCaAvosGmBBwb035K1WBHEs8eJ2lKmWfnec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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