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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5a3785817cb0b8368b7df93dc3720e57259d9eca406e692941a277a8baa314' 
  AND token = '1qwA+pMvNoYNTOMvJMr3nt2nz7UJA8GbIN02jfbWMSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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