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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464f0fa858716c7fcb5c81545e7e8678885b3d0f574650dcf27899baf91700b7' 
  AND token = 'fGgj/rjqF1hG+hFe8By4hXS7gite+9IBB/7/OjDGBC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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