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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9654fbb09915c0661ae0c07d0b74a5b60e0c591b6e8778e9ca173ea2cf8162' 
  AND token = '6FFbaB4VfvGUG4ZWmB0/4s19Sh3BOFVBZ9d5fd78o7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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