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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe1bc2063421d7d64a7125c1b25130e876a7a2267ba290a23d3cf6b1e08356f' 
  AND token = '04N0og37+V+1CD2lo0x5LYwunTZD3I5Jbu77s24bstQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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