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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b969db6c2398384b670a881c8d092aafef1aba60aac183fdfa08c52d142a74b' 
  AND token = 'Gj+Hq2lkk5I1FWZuQGLggUn6QI9mr9Zc5UFDDmfy4/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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