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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb39be4e673295ca6e04cd910fb6c452612cb0ca0ed5afcb8ccba19549e14c3b' 
  AND token = 'v9BB07iApsqCr+EbU5HBdoxgLvWh1S/STI2AXnJxoNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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