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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93d595f341bb1e02c3b078a28fe3d05d0f919008e183419da6cb6b6d857950c' 
  AND token = 'VoJToMVOon4K3MhKKmh/5l7erYtuiOKKe+k7KOqgLTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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