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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09510ce9f999ebbb0be33f0247cdcfdc75114711ee755aa5389b1c8675505f9' 
  AND token = 'NeQBuRQrTPl9yZNl2mbYmEmpbg5p2M/pL43xU167bDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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