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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b39a1a774cb0fa630b0b970aa8beee6935320038aacd79ec9d9705fe5751c1' 
  AND token = '44Wfn/pm4OxoWhSHuO3QZYDrnPo+dZhOYXDiOPI2vLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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