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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b090e5cfa713be19510db1c9ec7be62dab1d6a6ed85309db5a3a003da7556110' 
  AND token = 'J2obPPH/AKRTi3DqSF5KnxsM+WX2VQyz6VjrNTR2nfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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