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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203eaf2033e088bc23cb3a9d80fe7039f32857a75d71064ee6019104b6387b55' 
  AND token = 'Oc5Daa+iEElAjQ1BgktLUgm/WpsD45ZSXfb/iCRT7TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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