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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f595d3df411a7de684ddbe34f6ffb88e8a8f7f7b18a3fac212c6e573d4e423' 
  AND token = 'SAsy9tBqWnz4yMpK89YjNQk/0yImxgYudUQb6DsGuyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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