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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f13a3e4a00e6a39eaf09c5baf08c2a05356904803c076c6a84c3fb1c431761b' 
  AND token = 'gYI/dG/1uI8AE3rIN3vFPrMl8i8kzcCHHzzqE5fiP84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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