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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694ce161094cb0567cbee00f9a82c3b1c9074b25dc646f6282c91523483b1668' 
  AND token = 'IV1txRx3sN0BXI6TrzhJ6ME3IMtoXz1UO4x85GL5g04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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