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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44968587796695d4fdbeb3e79431414532ed3e4751634dc5474d2010b56151f9' 
  AND token = 'jIF1fJkuWfCwgUnb3/K5pDqR0gC1KoEQ8lclcWi6/h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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