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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a8f94e1d5fbcdd06d3e398ab990dcc5cd9d885790d71169056b21a7a5f6631a' 
  AND token = '+ULom8pyrtsCSqexJeJp7qBnCR2o7aSvBCTcRwyQFw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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