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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767eaa8f7ff6cef3a598cd8af4e751c99b357959e5f21f0c198a2df571d4ba1e' 
  AND token = '1hGGuBfNvJcJWevShHPi5cLvp3QWwpuSMpF/5/JZTSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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