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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870dbf6a3a50360c23ffed2b4d26849bfc1b69a656ef29cacdbfec4b392f7751' 
  AND token = 'vEXdBU0WQ0f8HdoZkN2BV5az+hhnKr1/fATScc/jIG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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