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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6f9288528d4db5cc8cef75a401d3abb3355b76389c0665438704a596ea93bb' 
  AND token = 'g8IhEAh9Y1DWSHG5l53/OLdJakADSLO2oRrfjuWMNgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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