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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2709bb8239df83dfc32be1ef6d6cbd24ffaabd84c2654c3990e3b48c29b840a2' 
  AND token = 'viTO+VT9FOHDTNoFRIPxDf9bw9Ogm4/QMKnNnhdI+NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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