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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0abe76b45ec5ce283e719c74a50da1aa263976dd39c1ae511a0f1c71b604ee' 
  AND token = 'nDwbQGRBYBXP09ots5WwjwnytDs7tKQEOG+WZQILs98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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