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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92ac907c481dca65bc122b1c2c55c0d3b666e692e35564a498d71bd5027b346' 
  AND token = 'fC6pR7TgUVCKX9iyUNmPZeGRffzgBxdA17I+Zb5n58Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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